Preventing carbon contamination of optical devices for X-rays: the effect of oxygen on photon-induced dissociation of CO on platinum

A time-dependent photoelectron spectroscopy study of the chemical reactions which take place at Pt(111) surfaces is presented. It is shown that the carbon contamination layer growth can be stopped and reversed by low partial pressures of oxygen for optics operated in intense photon beams at liquid-nitrogen temperature.

SUMS: synchronous undulator-monochromator scans at Synchrotron Soleil

The synchronous undulator-monochromator scans (SUMS) strategy developed at Synchrotron Soleil for performing X-ray absorption experiments at insertion-device beamlines is described.